For decades, it was thought that only stainless steel and yellow gold versions of reference 6265 existed. Until this White Gold Rolex Daytona 6265 Watch was discovered. Nicknamed "The Unicorn" for its one-of-a-kind nature, it was manufactured in 1970 and delivered to a German retailer in 1971. In the years since, the special order item has returned to Rolex on several occasions — most likely for service — and remains in outstanding condition. Its current owner purchased it eight years ago but is now putting this rare piece up for auction. It will go under the hammer at the Daytona Ultimatum event in Geneva on May 12, with the proceeds going to benefit the group Children Action.

Thinner and lighter than the smallest Apple Watch, the Fitbit Versa Smartwatch is a fine option for those not tied to the iPhone. It ditches the prior Ionic's polarizing angular form for a softer squared circle, yet retains key features like 24/7 heart rate monitoring, on-device fitness coaching, GPS, and activity tracking, including in the water and while you're asleep. It comes in four colors and in standard and NFC-equipped Special Edition models.

Designed specifically for tactical use, the Garmin Tactix Charlie Watch is rugged enough for the military yet stylish enough for everyday use. In addition to pre-loaded, full-color Topo mapping, it also offers mission-critical features like Jumpmaster support, GPS and GLONASS, and waypoint projection. Its black DLC-coated titanium bezel has UTC markers that work in conjunction with the always-on, 1.2-inch screen, while the opposite side houses a built-in heart rate monitor. With 12 days of battery life in smartwatch mode and up to 20 hours of GPS wayfinding, you won't need to worry about charging mid-journey, either.

A tough hiking boot makes a world of difference, but during warm weather months, you need something lighter and breathable. Built with a carbon-washed textile upper and a moisture-wicking air mesh liner, Danner's Mountain 600 EnduroWeave was made to dominate the summer climate and terrain of the Pacific Northwest. The boots also combine a cushioning Vibram SPE midsole for maximum rebound on the trails and a Fuga outsole for the control you need when navigating wet and dry surfaces. Available in brown and black.

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Instantly identifiable as a Slim model thanks to its Philippe Apeloig-penned typeface, the Hermès Slim d'Hermès GMT Watch adds a secondary hours subdial to its sleek design. Its powered by a Manufacture Hermès H1950 movement measuring just 2.6 mm thick, which works in concert with a 1.4 mm GMT module. Each piece of the dial — indices, GMT dial, and date counter — has its own finish to add visual interest and sits inside a palladium case measuring 39.5 mm around and just 9.48 mm thick. Finished with a matte graphite alligator strap crafted in Hermès' workshop and limited to just 90 examples worldwide.

Inspired by water — the River Rhine in particular — the Oris Source of Life Watch is a special version of the Aquis diver. Most notable on its deep blue face is the circular date scale and the white indicator that takes month-long laps around the dial to show the date. Its 43.5mm stainless steel case is enhanced by a gray tungsten bezel insert and a backplate embossed with a map of the Rhine. It's finished with either a stainless steel metal bracelet or gray rubber strap, and is limited to just 2,343 pieces to reflect the sea level height of Lai da Tuma, the source of the Rhine.